Fiat 127 - Page 6

Fiat 127 Internet Fan Club (http://fiat127.okruhy.cz) Fiat 127 - 1050
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Crankshaft inches mm
Main bearing journal diameter 1.8972 to 1.898 48.189 to 48.209
Standard main bearing shell thickness 0.0721 to 0.0726 1.831 to 1.845
Main bearing shell undersize range 0.01; 0.02; 0.03; 0.04 0.254; 0.508; 0.762; 1.016
Standard crankpin diameter 1.7318 to 1.7326 43.988 to 44.008
Main bearing journal fit clearance 0.0009 to 0.033 0.022 to 0.083
Width of centre main bearing cap between
thrust washers
1.2785 to 1.2805 32.475 to 32.525
Standard thrust washers thickness 0.0909 to 0.0929 2.31 to 2.36
Thrust washers oversize range 0.0959 to 0.0979 2.437 to 2.487
Crankshaft endfloat 0.0022 to 0.0104 0.055 to 0.265
Maximum misalignment of main bearing
journals
0.0012 0.030
Maximum misalignment of main bearing
journals to crankpins
0.0138 0.350
Maximum ovality of crankpins and main
bearing journals after grinding
0.0002 0.005
Maximum taper of crankpins and main
bearing journals after grinding
0.0002 0.005
Maximum run-out of crankshaft flange with
dial gauge stylus 31 mm (1.22 ins) from
crankshaft rotational axis
0.001 0.025
Maximum run-out between flywheel face
and crankshaft flange, and between
flywheel face and crankshaft axis
0.0039 0.10
Cylinder head inches mm
Standard valve guide housing bore 0.5886 to 0.5896 14.950 to 14.977
Standard valve outside diameter 0.5921 to 0.5928 15.040 to 15.058
Oversize valve guide 0.002; 0.0039; 0.0098
0.05; 0.10; 0.25
Valve guide interference fit 0.0025 to 0.0043 0.063 to 0.108
Fitted valve guide internal diameter 0.3158 to 0.3165 8.022 to 8.040
Valve stem diameter 0.3139 to 0.3146 7.974 to 7.992
Valve stem fit clearance in guide 0.0012 to 0.0026 0.030 to 0.066
Valve head diameter:
Inlet (C, L and CL) 1.3327 to 1.3445 33.85 to 34.15
Inlet (Sport) 1.4311 to 1.4429 36.35 to 36.65
Exhaust 1.1358 to 1.1476 28.85 to 29.15
Valve seat width 0.0787 to 0.0866 2.0 to 2.2
Valve seat internal diameter:
Inlet (C, L and CL) 1.1063 to 1.1142 28.1 to 28.3
Inlet (Sport) 1.2244 to 1.2323 31.1 to 31.3
Exhaust (C, L and CL) 0.9882 to 0.9961 25.1 to 25.3
Inlet (Sport) 1.0276 to 1.0354 26.1 to 26.3
Angle of valve seat 45° ± 5'
Angle of valve face 45° 30' ± 5'
Valve springs:
Inner spring part no. 4134900
Outer spring part no. 4170458
Valve gear inches mm
Camshaft journal diameter:
Valve gear end 1.1789 to 1.1795 29.945 to 29.960
Centre 1.0630 to 1.0636 27.000 to 27.015
Flywheel end 0.9843 to 0.9848 25.000 to 25.015